Question

Which one of the following assumptions in deriving the boundary layer equation of flow past a flat plate at zero incidence is not correct ?

• A. uniform flow =0
• B. Outside boundary layer velocity is $V_0$ throughout
• C. The boundary layer thickness $\delta$ is very small compared to distance x
• D. Pressure remains constant throughout the flow both within and outside the boundary layer

Answer 1

The correct option is A uniform flow =0

Assumptions in deriving boundary layer equation
$\bullet$ Pressure is constant both within and outside the boundary layer

$\bullet$ Boundary layer thickness is very small compared to other linear dimensions

$\bullet$ Velocity outside boundary layer is constant throughout